Mongoose dynamic query - node.js

Question

Query parsed from URL, example :
?year=2014&cat=sonny
Or it can be
?year=2014&id=223&something=high&cat=sonny
I could do
Model.find({year: 2014}).where('cat').equals('sonny')
But what if there a second example? How can I make it dynamic?

Answer 1

You can set the query to a variable and add multiple conditions:
var query = Model.find();
query.where('year').equals('2014');
query.where('cat').equals('sonny');
query.where('id').equals('223');
query.where('something').equals('high');
query.exec(callback);
For dynamic, just pass the query to a for loop and iterate through an array of your filter objects:
var query = Model.find();
var filters = [
{fieldName: "year", value: "2014"},
{fieldName: "cat", value: "sonny"}
...
];
for (var i = 0; i < filters.length; i++) {
query.where(filters[i].fieldName).equals(filters[i].value)
}
query.exec(callback);

Answer 2

Building on the cdbajorin's answer - I suspect many coders are trying to take input from a form and dynamically build a Mongoose filter from the end users input. (or at least that was my scenario).
If you 'name' the html input fields the same as your Mongoose Schema name
<input type='text' name='person.address'>
Then in your code you can use the req.body object
var query = Model.find();
for (var fieldName in req.body)
{
if(req.body.hasOwnProperty(fieldName)) //no inherited properties
{
if(req.body[fieldName]) //get rid of empty fields
{
query.where(fieldName).equals(req.body[fieldName]);
}
}
}
query.exec(function(err,data){console.log('QUERY EXECUTE : ' + err, data, data.length);});